JPH06217238A - Image display device - Google Patents

Abstract

PURPOSE:To emit lights from light emitting elements which are uneven in interval to the outside from positions which are even in interval. CONSTITUTION:Lights from light emitting elements 14 in a glass case 16 are emitted to the outside through an optical fiber layer 21 in contact with the upper side of the glass case 16. The optical fiber layer 21 is sectioned in an S shape and has its projection surfaces deviating from its incidence surfaces aligned with the light emitting elements 14 laterally or longitudinally by specific distance. Further, the projection surfaces of the optical fiber layer 21 are arranged at the same intervals P including the optical fiber layer 21 at the border parts of cells 13. Consequently, even if lateral intervals PO and P1 of the light emitting elements 14 are uneven, the lights from the light emitting elements 14 can be emitted to the outside at the same intervals. Consequently, a image on a large-sized video device can be made homogeneous. Further, an optical fiber layer 21 which is large in NA is used to obtain a wide visual field angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device suitable for application to a large-scale image device or the like.

[0002]

2. Description of the Related Art As shown in FIG. 9, in a large-sized image device 1 having vertical and horizontal dimensions of several meters, a screen 1
1 is divided into a plurality of units 12, and one unit 12 is further divided into a plurality of cells 13. In the cell 13, as shown in FIG. 10A, for example, four light emitting elements 14 are arranged on each of the upper and lower sides.

The light emitting element 14 is composed of a blue light emitting body 14A, a red light emitting body 14B, and a green light emitting body 14C. As shown in FIG.
Is installed. A video signal is supplied to the electrode portion 15 from the outside to emit an electron beam, which emits light.
The light emitting element 14 emits light when irradiated with the light. As a result, an image is displayed on the screen 11.

Further, the inside of the cell 13 is hermetically sealed in a vacuum state by a transparent glass cover 16 so that the internal insulating property is maintained.

[0005]

By the way, when the cell 13 is arranged on the screen 11, the intervals P0, P between the light emitting elements 14 are arranged.
It is desirable that 1 is the same. This is because a uniform image can be obtained. However, in the past, the distance P between the light emitting elements 14 in the cell 13 has been reduced for the reason described below.
0 and the interval P1 between the light emitting elements 14 at the boundary of the adjacent cells 13 could not be made the same.

That is, as shown in FIG. 11, the glass cover 1 of each cell 13 is located at the boundary between adjacent cells 13.
Six side plate portions 16A overlap each other. The thickness d1 of the glass cover 16 cannot be made so thin in terms of strength, and a certain amount of gap d0 must be provided between the cells 13, so the dead space D = d0 + 2 × at the boundary of the cells 13. d1 occurs.

Since the light emitting element 14 must be arranged at a distance d2 from the side plate portion 16A, the distance P1 between the light emitting elements 14 at the boundary between the cells 13 is P1 = D + 2 × d2 even when the distance is minimum. Become. This interval P1 has a relatively large value. Here, if the interval P0 of the light emitting elements 14 in the cell 13 is matched with the interval P1 of the boundary portion of the cell 13, there arises a problem that the lateral width of the cell 13 becomes large and the light emission efficiency also deteriorates.

Therefore, conventionally, the light emitting element 1 in the cell 13 has been conventionally used.
The interval P0 of 4 is made narrower than the interval P1 of the light emitting elements 14 at the boundary portion to improve the light emission efficiency and downsize the cell 13. Therefore, when the cells 13 are arranged vertically and horizontally, the intervals P0 and P1 of the light emitting elements 14 become non-uniform.
Although the horizontal intervals P0 and P1 have been described with reference to FIG. 11, the vertical interval also has the same problem.

In the conventional large-sized image device 1, a convex lens (not shown) is attached to the front surface side of the glass cover 16 to enlarge a portion other than the dead space D, so that the light emitting element 14 in the cell 13 can be formed. There is a device in which the interval P0 and the interval P1 of the light emitting elements 14 at the boundary of the cells 13 look the same, but this works effectively only for the observer near the optical axis of the convex lens, so that a wide field of view is obtained. There is a problem that it is almost useless for applications that require corners.

The present invention solves the above problems and proposes an image display device capable of obtaining a uniform image with a wide viewing angle.

[0011]

In order to solve the above problems, in the present invention, an image display device having a plurality of light emitting elements arranged vertically and horizontally and a transparent cover arranged on the surface side of the light emitting elements. In the above, the optical fiber layer for guiding the light emitted from the light emitting element to a predetermined position is provided in close contact with the transparent cover.

[0012]

In FIG. 1, light from the light emitting element 14 in the glass case 16 of the cell 13 is radiated to the outside through the optical fiber layer 21 which is in close contact with the upper side of the glass case 16. The optical fiber layer 21 has an S-shaped cross section as shown in FIG.
2, the emission surface 23 is displaced by a predetermined dimension in the X direction and the Y direction.

The emission surface 23 of the optical fiber layer 21 is arranged at the same intervals P and Q including the optical fiber layer 21 at the boundary of the cell 13. As a result, the intervals P0, P1 in the horizontal direction and the interval Q in the vertical direction of the light emitting element 14
Even if 0 and Q1 are not uniform, it is possible to radiate light from the light emitting element 14 to the outside from the positions of the same intervals P and Q. As a result, it becomes possible to make the image of the large-scale image device 1 (FIG. 9) and the like uniform.

[0014]

Next, one embodiment of the image display apparatus according to the present invention will be described in detail with reference to the drawings. In addition,
The same parts as those described above are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 shows an arrangement example of cells 13 to which the image display device according to the present invention is applied. This figure is a part of the screen 11 of the large-sized image device 1 (FIG. 9). In the figure, cell 13
Four light-emitting elements 14 are arranged in the upper and lower parts of the inside of the above, as indicated by the one-dot chain line. Each light emitting element 14 is a blue light emitting body 1.
4A, a red light emitter 14B, and a green light emitter 14C. Each of the light emitters 14A to 14C emits light by an electron beam emitted from an electrode portion 15 attached to the rear side as shown in FIG. . A video signal is externally supplied to the electrode portion 15, and an electron beam is emitted based on the video signal. The light emitting elements 14 are arranged laterally with an interval P0.

The inside of the cell 13 has a transparent glass cover 16
It is sealed in a vacuum state. In addition, the adjacent cell 13
A gap d0 is provided at the boundary portion of. The thickness of the side plate portion 16A of the glass cover 16 is d1, and a dead space D = d0 + 2 × d1 occurs at the boundary portion of the cells 13.
Then, the side plate portion 16A of the glass cover 16 and the light emitting element 1
4 is provided with an interval d2, and the interval P1 between the light emitting elements 14 at the boundary between the adjacent cells 13 is P1 = D.
It is + 2 × d2. This is a value larger than the interval P0 between the light emitting elements 14 in the cell 13 as in the conventional case.

Further, as shown in FIG. 3, the light emitting elements 14 in the cell 13 are arranged with a space Q0 in the vertical direction, and the vertical space Q1 of the light emitting elements 14 at the boundary of the cell 13 is Q1 = D + 2 × d2> Q0.

In the cell 13 to which the present invention is applied, an optical fiber layer 21 having an S-shaped cross section is attached on the surface side of the glass cover 16 so as to be aligned with the light emitting element 14. The optical fiber layer 21 can be formed by a manufacturing method as described below, and as shown in FIG. 4, an exit surface 23 is formed by a predetermined dimension X1 in the X direction with respect to an entrance surface 22 facing the light emitting element 14. It is possible to shift.

This makes it possible to guide the light emitted from the light emitting element 14 to a position moved by a predetermined dimension X1 in the X direction. By rotating the optical fiber layer 21 along the light emitting surface 14D of the light emitting element 14 by a predetermined angle, the light from the light emitting element 14 can be moved by a predetermined dimension in the X direction and the Y direction. In this case, the inclining surface 22 must have a shape and size that can cover the light emitting surface 14D of the light emitting element 14.

Now, in this cell 13, as described above, the incident surface 22 of the optical fiber layer 21 is attached to the glass case 16 so as to be aligned with the light emitting element 14, and the emitting surface 23.
The distance P in the horizontal direction is the same as that of the optical fiber layer 21 at the boundary between the adjacent cells 13. Further, the vertical distance Q between the emission surfaces 23 is the same, including the optical fiber layer 21 at the boundary of the cell 13.

As a result, the light emitting element 14 in the cell 13 is
Although the distances P0 and Q0 are different and the distances P1 and Q1 of the light emitting elements 14 at the boundary between the adjacent cells 13 are different, the light of the light emitting elements 14 are arranged at the same distances P and Q. The light is radiated to the outside from the emission surface 23 of. Therefore, it is possible to obtain a uniform image in the large-sized image device 1 in which the cells 13 are arranged.

As shown in FIG. 5, the above-mentioned optical fiber layer 21 is a predetermined optical fiber plate 25 formed by laminating and crimping a plurality of resin optical fiber sheets 24 into a corrugated shape with a cut surface 26 perpendicular to the corrugated surface. Can be formed by cutting to a thickness T of.

Further, as shown in FIG. 6, the optical fiber plate 25 is formed by inserting a plurality of optical fiber sheets 24 into a lower mold 32 having a corrugated bottom surface 31 and pressing the upper mold 33 in a corrugated shape while heating them. It can be manufactured by pressing on the surface 34. The optical fiber sheet 24 may be formed by adhering the optical fiber wire 27 in a sheet shape.

It is desirable that the optical fiber layer 21 has a viewing angle as large as possible. This viewing angle is determined by the NA (Numerical Apertu) of the optical fiber line 27.
re). As shown in FIG. 7, when the receivable angle of the optical fiber line 27 is 2θmax, the refractive index of the core 28 is n1, and the refractive index of the clad 29 is n2, NA =
sin (θmax) = ((n1) ² − (n2) ² ) ^1/2 .

Various materials can be used as the material of the optical fiber wire 27. When polycarbonate is used for the core 28 and fluorine resin is used for the clad 29,
Since the refractive index of the core 28 is n1 = 1.584 and the refractive index of the clad 29 is n2 = 1.402, NA = 0.737. Actually, this NA is the upper limit.

In the above embodiment, the case where the optical fiber layer 21 having an S-shaped cross section is used has been described. However, in addition to this, for example, the optical fiber layer 21 having a J-shaped cross section as shown in FIG. 8 and others. It is possible to use optical fiber layers having various cross-sectional shapes.

[0027]

As described above, the present invention provides an image display device having a plurality of light emitting elements arranged vertically and horizontally and a transparent cover arranged on the surface side of the light emitting element,
The transparent cover is provided with an optical fiber layer for guiding the light emitted from the light emitting element to a predetermined position.

Therefore, according to the present invention, even when the intervals of the light emitting elements are not uniform, for example, in a large-sized image device,
By appropriately forming the optical fiber layer, it is possible to radiate the light of the light emitting element to the outside at equal intervals, so that uniform image quality can be obtained and the optical fiber layer having a large NA is used. This has the effect of enabling a wide viewing angle.

[Brief description of drawings]

FIG. 1 is a cell 1 to which an image display device according to the present invention is applied.
It is a figure explaining the example of arrangement | positioning of FIG.

FIG. 2 is a cross-sectional view of a cell 13.

FIG. 3 is a vertical sectional view of a cell 13.

FIG. 4 is a detailed view of the optical fiber layer 21.

FIG. 5 is a diagram illustrating a method of molding the optical fiber layer 21.

FIG. 6 is a diagram illustrating a method of manufacturing the optical fiber plate 25.

FIG. 7 is a detailed view of an optical fiber line 27.

FIG. 8 is a diagram illustrating a modified example of the optical fiber layer 21.

FIG. 9 is a configuration diagram of a general large-sized image device 1.

FIG. 10 is a configuration diagram of a conventional cell 13.

FIG. 11 is a cross-sectional view showing a boundary portion of a conventional cell 13.

[Explanation of symbols]

 1 Large Image Device 11 Screen of Large Image Device 1 12 Unit 13 Cell 14 Light Emitting Element 15 Electrode Part 16 Transparent Glass Case 21 Optical Fiber Layer 22 Incident Surface 23 Emission Surface 24 Optical Fiber Sheet 25 Optical Fiber Plate

Claims (4)

[Claims] 1. An image display device having a plurality of light emitting elements arranged vertically and horizontally and a transparent cover arranged on the front surface side of the light emitting element, wherein light emitted from the light emitting elements is guided to a predetermined position. An image display device, characterized in that an optical fiber layer is provided in close contact with the transparent cover. 2. The image display device according to claim 1, wherein the optical fiber layer is a laminated body of optical fiber sheets. 3. The image display device according to claim 1, wherein the optical fiber layer is cut out from a laminate of strip-shaped optical fiber sheets. 4. The image display device according to claim 1, wherein the optical fiber layer has an S-shaped or J-shaped cross section.